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Investigating HSRP

Hot Standby Router Protocol (HSRP) is a Cisco propitiatory router protocol that provides first-hop redundancy for IP hosts on a LAN. It enables a set of router interfaces once configured to present a single virtual default gateway for IP hosts on the LAN.

HSRP has two modes:

ACTIVE – Physical router acts as the main router, by default the highest IP Address is elected the active router

STANDBY – The second physical router that participates in HSRP and becomes the active router when the elected active router fails

HSRP priorities can be used to determine the active router. The default priority is 100

HSRP versions:

The default version used for Cisco IOS 15 is Version 1

Version 2 expands the number of supported groups from 0-255 in version 1 to 0-4095

HSRPv2 virtual mac addresses follow the same method as version 1, the only difference is that v2 uses 3 hex digits to represent the HSRP group as shown the this example: 0000.0c9f.f000 – 0000.0c9f.ffff (IPv4 range)

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Published by iwiizkiid

I have over 3 year experience working with mainly Cisco products. My main interest areas are currently Routing & Switching and Security. I have multiple Cisco certifications and more recently was selected as a Cisco Champion.
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